Question Please help???

When downloading games i noticed PAL, or NTSC, i know what ntsc but can u download PAL and use those games on a modded 4.2u wii?Or do you have to change the format for it? If thats the case can you tell me what program i can download to do this?

1more question i use the usb for my games but i was wondering if i can say rent a game and be able to back it up and save it so i can play it, can someone please tell me how to do it and what program i would need to get threw the passes?? ty